sell someone out
背叛某人,出卖某人
口语·形容背叛或出卖他人
英文释义
to betray or deceive someone, often for personal gain or advantage
例句
I trusted him, but he sold me out to the boss for a promotion.
典故来源
源自19世纪商业或政治语境，原指出售股份或背叛盟友，后泛指为私利出卖他人。